967
FZUS63 KMKX 040740
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
240 AM CDT Fri Apr 4 2025

FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON Lake Michigan.

Waves are provided as a range of significant wave heights, which
is the average of the highest 1/3 of the wave, along with the
average height of the highest 10% of the waves which will
occasionally be encountered.

.SYNOPSIS...

30.2 inch high pressure is centered over the western Great Lakes
early this morning, resulting in light winds across the open
waters. Said high will quickly progress east into Ontario today,
allowing northeast surface winds to become established over the
entirety of Lake Michigan. Said winds will increase overnight
tonight as 29.8 inch low pressure develops in the middle
Mississippi River Valley, particularly across the southern half of
the open waters. Gusts up to 20 knots will be possible during
this time frame. Breezy conditions will continue into the day on
Saturday as the aforementioned surface low quickly moves across
Lakes Erie and Ontario. This progression will allow winds to turn
out of the north-northwest by early Saturday afternoon. Winds will
taper slightly Saturday night, when 30.1 inch high pressure will
build into the northern Great Plains.

Winds will briefly shift out of the south-southwest during the day
on Sunday, when low pressure of 29.9 inches is forecast to
develop over east-central Ontario. The low will progress south
Sunday evening as it deepens to near 29.8 inches, passing near or
just east of the open waters by Monday morning. Winds will shift
out of the north to northwest behind the departed surface low on
Monday, becoming gusty by late morning. Widespread gusts between
25-30 knots are forecast through Monday afternoon, with a few
gusts up to gale force possible. Trends will be monitored in the
coming forecasts for possible headlines. Gusts will taper Monday
night as 30.2 inch high pressure moves into the western Great
Lakes.

LMZ261-362-364-366-563-565-567-868-041515-
Lake Michigan from Seul Choix Point to Rock Island Passage 5 NM
offshore to Mid Lake-
Lake Michigan South of a line from Seul Choix Point to the
Mackinac Bridge and north of a line from Charlevoix MI to South
Fox Island 5 NM offshore-
Lake Michigan from Charlevoix to Point Betsie MI 5 NM offshore to
Mid Lake-
Lake Michigan from Point Betsie to Manistee MI 5 NM offshore to
Mid Lake-
Lake Michigan from Rock Island Passage to Sturgeon Bay WI-
Lake Michigan from Sturgeon Bay to Two Rivers WI 5 NM offshore to
Mid Lake-
Lake Michigan from Two Rivers to Sheboygan WI 5 NM offshore to
Mid Lake-
Lake Michigan from Pentwater to Manistee MI 5 NM offshore to Mid
Lake-
240 AM CDT Fri Apr 4 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...Northeast winds 5 to 10 kt increasing to 10 to 15 kt.
Waves 1 to 2 ft.
.TONIGHT...Northeast winds 10 to 15 kt diminishing to 5 to 10 kt.
Chance of rain showers. Waves 1 to 2 ft.
.SATURDAY...Northeast winds 10 to 15 kt becoming north 10 to
20 kt late in the morning, then becoming northwest early in the
afternoon increasing to 15 to 25 kt late. Waves 2 to 4 ft.
.SATURDAY NIGHT...North winds 15 to 25 kt becoming northwest
10 to 20 kt. Waves 2 to 4 ft.
.SUNDAY...West winds 10 to 20 kt becoming southwest. Waves 1 to
3 ft.
.SUNDAY NIGHT...Southwest winds 10 to 20 kt veering to north.
Chance of snow showers. Waves 1 to 3 ft building to 3 to 5 ft.
.MONDAY...North winds 15 to 25 kt increasing to 30 kt. Chance of
snow showers. Waves 4 to 7 ft occasionally to 9 ft.
.TUESDAY...Northwest winds 10 to 20 kt becoming west. Waves 3 to
5 ft subsiding to 2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-041515-
Lake Michigan from Michigan City IN to St. Joseph MI 5 NM
offshore to Mid Lake-
Lake Michigan from Sheboygan to Port Washington WI 5 NM offshore
to Mid Lake-
Lake Michigan from Port Washington to North Point Light WI 5 NM
offshore to Mid Lake-
Lake Michigan from North Point Light to Wind Point WI 5 NM
offshore to Mid Lake-
Lake Michigan from Wind Point WI to Winthrop Harbor IL 5 NM
offshore to Mid Lake-
Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5 NM
offshore to Mid Lake-
Lake Michigan from Wilmette Harbor IL to Michigan City IN 5 NM
offshore to Mid Lake-
Lake Michigan from Whitehall to Pentwater MI 5 NM offshore to Mid
Lake-
Lake Michigan from Grand Haven to Whitehall MI 5 NM offshore to
Mid Lake-
Lake Michigan from Holland to Grand Haven MI 5 NM offshore to Mid
Lake-
Lake Michigan from South Haven to Holland MI 5 NM offshore to Mid
Lake-
Lake Michigan from St. Joseph to South Haven MI 5 NM offshore to
Mid Lake-
240 AM CDT Fri Apr 4 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...East winds 5 to 10 kt becoming northeast 10 to 15 kt.
Chance of rain showers this afternoon. Waves 1 to 2 ft.
.TONIGHT...Northeast winds 10 to 20 kt. Rain showers. Waves 2 to
4 ft.
.SATURDAY...North winds 10 to 20 kt. Waves 4 to 6 ft occasionally
to 8 ft.
.SATURDAY NIGHT...North winds 10 to 20 kt. Waves 4 to 6 ft
occasionally to 8 ft.
.SUNDAY...North winds 10 to 20 kt becoming west. Waves 3 to 5 ft.
.SUNDAY NIGHT...South winds 10 to 15 kt becoming southwest 10 to
20 kt. Waves 1 to 3 ft building to 2 to 4 ft.
.MONDAY...Northwest winds 15 to 25 kt becoming north to 30 kt.
Chance of snow showers. Waves 6 to 9 ft occasionally to 12 ft.
.TUESDAY...Northwest winds 10 to 20 kt. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 3 to 5 ft.

$$

LMZ761-041515-
MAFOR 0410/
MICHIGAN NORTH 11800 12200 13110 11210 11200. A chance of rain
showers tonight. Waves 2 feet or less.

MICHIGAN SOUTH 11100 11210 13110 11126 11116 11126. Waves 2 feet
or less today. Waves 1 to 3 feet tonight.

$$


Quigley

Experimental modernized open lake forecast is available online at
weather.gov/mkx/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes